[PATCH v2 0/7] Add support for Rpi4b + Cirrus Lochnagar2 and CS47L15

[Richard Fitzgerald]

This set of patches provides support for using the Raspberry Pi 4b with
a Cirrus Logic Lochnagar 2 audio development platform plus Cirrus Logic
CS47L15 codec.

Patches are needed to audio-graph-card to enable support for setting the
component sysclks and plls. The codec sysclks and plls cannot be placed
under the clock framwork because they are I2C/SPI-connected peripherals
and access to the registers would cause a nested get of the I2C/SPI bus
clock. The clock framework does not support this and it would result in
a deadlock.

Richard Fitzgerald (7):
  of: base: Add of_count_phandle_with_fixed_args()
  ASoC: audio-graph-card: Add plls and sysclks DT bindings
  ASoC: audio-graph-card: Support setting component plls and sysclks
  ASoC: arizona: Allow codecs to be selected from kernel config
  ASoC: madera: Allow codecs to be selected from kernel config
  ARM: dts: Add dts for RPi4b + Cirrus Logic Lochnagar2 + CS47L15
  MAINTAINERS: Add dts for Cirrus Logic Lochnagar on RPi4

 .../bindings/sound/audio-graph-card.txt       |  44 ++++
 MAINTAINERS                                   |   1 +
 arch/arm/boot/dts/Makefile                    |   1 +
 ...bcm2711-rpi4b-cirrus-lochnagar-cs47l15.dts | 166 +++++++++++++++
 .../dts/bcm2711-rpi4b-cirrus-lochnagar.dtsi   | 201 ++++++++++++++++++
 drivers/of/base.c                             |  73 +++++--
 include/linux/of.h                            |   9 +
 include/sound/simple_card_utils.h             |  24 +++
 sound/soc/codecs/Kconfig                      |  18 +-
 sound/soc/generic/audio-graph-card.c          |  16 +-
 sound/soc/generic/simple-card-utils.c         | 184 ++++++++++++++++
 11 files changed, 703 insertions(+), 34 deletions(-)
 create mode 100644 arch/arm/boot/dts/bcm2711-rpi4b-cirrus-lochnagar-cs47l15.dts
 create mode 100644 arch/arm/boot/dts/bcm2711-rpi4b-cirrus-lochnagar.dtsi

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2.20.1